ICT IGCSE Theory Revision Presentation 2.1 Input devices and their uses
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1 ICT IGCSE Theory Revision Presentation The key concepts covered in this chapter are: >> Input devices and their uses >> Direct data entry and associated devices >> Output devices and their uses Identify input devices and their uses, e.g. keyboard, numeric keypad, pointing devices (such as mouse, touchpad, tracker ball), remote control, joystick/driving wheel, touch screen, scanners, digital cameras, microphone, sensors (general), temperature sensor, pressure sensor, light sensor, graphics tablet, video camera, web cam Vocabulary & Acronyms to remember: >> PIN Personal Identification Number >> ATM Automatic Teller Machines >> Trackerball - (alternative to mouse) >> RFID (radio frequency identification) readers >> MICR (magnetic ink character recognition) >> OMR (optical mark reader) >> OCR (optical character reader) >> Bar Code Reader >> CRT Monitors >> TFT (thin film transistor/lcd) >> IPS (in-plane switching) >> Printers Laser, Inkjet, Dot matrix, Wide format, 3D,
2 in their Use allow data to be input into a computer. Input Devices Central Processing Unit (CPU) Storage Output Devices
3 Keyboard Inputting data into applications Typing commands into a CLI Interface Numeric Key Pad Inputting numeric data into: ATM POS Terminals Chip and Pin Mobile Phones etc. Easy and familiar to use Fast entry of Text into a document Straight forward to enter numeric data like pins or prices at a POS. Slower method compared to direct data entry. Keys can be too small. Difficult to type letters (older Mobiles to text)
4 Mouse To control the pointer on the screen to: Selecting Windows Clicking Icons Menu Options Positioning Pointer Touch Pad Used as a pointing device on a laptop. Tracker Ball Used by users who tend to have limited motility in their wrist (RSI) Easy to navigate through menu options Quicker to select an option compared to using a keyboard. Is part of the keyboard so no need for separate device. Easier to use compared to mouse More accurate positing of the pointer. Easily Damaged Flat surface required. More difficult to use compared to a normal mouse. Tend to be more expensive. Not familiar to users.
5 Remote Control Used to control: TV Channels and Menu options Multimedia Systems Industrial applications Joystick Used in computer games and simulators. Driving Wheel Used by gamers in computer games (Racing/Driving). Used in simulators. Can be used from a distance. Easier to used compared to a keyboard. Driving experience is more accurate than using keyboards. Signal could be blocked by obstacles or walls. More difficult to use compared to a normal mouse. More expensive. Movement could be too sensitive
6 Touch Screen Used on: Mobile/Tablets Point of Sale (POS) Interactive White Boards Scanners Used to scan in documents or photographs. Digital Cameras Used to take photographs and small video clips. Data can be transferred to computers. Very easy to use and select options. Copies can be created. Higher Resolution images can be stored on memory cards. No need to develop film. Options could be selected accidently. Screen can get dirty. Quality is dependant on resolution settings. Transferring, storing and editing images can be complicated
7 Video Cameras Used to record video footage. Microphone Used to input sound into a computer. Used in voice recognition applications. Graphics Tablet Used with a stylus to draw free hand drawings which can be stored on a computer. Can record in HD Footage can be edited on a computer. Voice overs can be added to presentations. Recorded audio can be typed directly into Word Processor applications. Very accurate method of drawing compared to a pointer device. HD movie take up a lot of storage. Cost of camera Voice recognition is not as accurate as typing text into a computer. Longer to produce drawings Cost of tablet
8 Web Cams Used by users who want to have a web conference (Skype Call) Light Pens Used in CAD applications for drawing onscreen Allows for face to face video chat. Can contact people without the need to travel. More accurate than touch screens Small in size Quality is dependant on internet connection Only used with CRT Monitors Dated Technology
9 : Sensors A sensor is a device that converts a real world property into data that a computer can process. Sensor Temperature Light Moisture Water-Level Proximity Movement Pressure Example Use Used in green houses to measure temperature Umpires check light conditions in cricket match To check the moisture in the soil in a green house Used in washing machine to measure water level Used when parking cars to judge distance. Detects movement which could trigger an alarm Used in burglar alarms
10 : Sensors Real world measurements are collected as an analogue signal from the sensor. A computer only understands digital signals. An ADC (Analogue-to-digital converter) is needed to convert the signal so a computer understands the signal. Data collected from Sensor is in Analogue ADC - Analogue-to-digital converter Analogue Signal now can be understood by computers.
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